Journal of Forest Science, 2018 (vol. 64), issue 11
LaiPen LP 100 - a new device for estimating forest ecosystem leaf area index compared to the etalon: A methodologic case studyOriginal Paper
Jakub ČERNÝ, Jan KREJZA, 4, Radek POKORNÝ, Pavel BEDNÁŘ
J. For. Sci., 2018, 64(11):455-468 | DOI: 10.17221/112/2018-JFS 
Fast and precise leaf area index (LAI) estimation of a forest stand is frequently needed for a wide range of ecological studies. In the presented study, we compared side-by-side two instruments for performing LAI estimation (i.e. LaiPen LP 100 as a "newly developed device" and LAI-2200 PCA as the "world standard"), both based on indirect optical methods for performing LAI estimation in pure Norway spruce (Picea abies (Linnaeus) H. Karsten) stands under different thinning treatments. LAI values estimated by LaiPen LP 100 were approximate 5.8% lower compared to those measured by LAI-2200 PCA when averaging all collected data regardless of the...
Study of the LiDAR accuracy in mapping forest road alignments and estimating the earthwork volumeOriginal Paper
Benyamin MATINNIA, Aidin PARSAKHOO, Jahangir MOHAMADI, Shaban SHATAEE JOUIBARY
J. For. Sci., 2018, 64(11):469-477 | DOI: 10.17221/87/2018-JFS
Today, differential geographical position system and total station devices are improving the accuracy of positioning information, but in critical locations such as steep slopes and closed canopy cover, the device accuracy is limited. Moreover, field surveying in this technique is time-consuming and expensive. For this reason, remote sensing technique such as light detection and ranging (LiDAR) laser scanner should be used in field measurements. The objective of this study was to evaluate and compare precision and time expenditure of total station and airborne LiDAR in producing horizontal and vertical alignments and estimating earthwork volume of two...
Assessing horizontal accuracy of inventory plots in forests with different mix of tree species composition and development stageOriginal Paper
Vlastimil MURGAŠ, Ivan SAČKOV, Maroš SEDLIAK, Daniel TUNÁK, František CHUDÝ
J. For. Sci., 2018, 64(11):478-485 | DOI: 10.17221/92/2018-JFS
Global navigation satellite systems (GNSS) have a wide range of applications in forest industry, including forest inventory. In this study, the horizontal accuracy of 45 inventory plots in different forest environments and 5 inventory plots under open sky conditions were examined. The inventory plots were located using a mapping-grade GNSS receiver during leaf-on season in 2017. True coordinates of the plot centres were acquired using a survey-grade GNSS receiver during leaf-off season in 2018. A study was conducted across a range of forest conditions in the forest unit Vígľaš, which is located in Slovakia (Central Europe). Root mean square error of...
Do stand structure and admixture of tree species affect Scots pine aboveground biomass production and stability on its natural site?Original Paper
Ondřej ŠPULÁK, Jiří SOUČEK, Jakub ČERNÝ
J. For. Sci., 2018, 64(11):486-495 | DOI: 10.17221/117/2018-JFS
The paper analyses stand structure and production on two experimental forest stand series of mature pure and mixed Scots pine stands, growing on natural Scots pine sites in the Czech Republic. Sessile oak was the main admixed species. In mixed stands, Scots pine constituted the dominant level of the stand, admixed species grew mostly as subdominants. Admixture increased stand densities and aboveground biomass production compared to pure stands. Sessile oak with the 20-30% number share within the Scots pine stand led to an increase of the Scots pine tree dimensions and mean stem merchantable wood (DBH ≥ 7 cm) volume compared to the pure Scots pine...